Yumiko had a secret that she absolutely had to keep hidden. A physical relationship with a student. For Yumiko, it was such an exciting time that she was willing to take the risk of ending her teaching career if it was discovered. However, recently, the student had begun to press her for a relationship even at school, seeking further excitement. It was too dangerous. Reason told her so. But Yumiko's escalating desires could not suppress her urge for thrills...